Structural determination of a highly stable metal-organic framework with possible application to interim radioactive waste scavenging: Hf-UiO-66

High-resolution synchrotron radiation x-ray powder diffraction (HR-XRPD) combined with Hf L3-edge extended x-ray absorption fine structure allowed us to determine the structure of a Hf-UiO-66 metal-organic framework (MOF) showing that it is isoreticular to Zr-UiO-66 MOF [Cavka et al., J. Am. Chem. S...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-09, Vol.86 (12), Article 125429
Main Authors: Jakobsen, Søren, Gianolio, Diego, Wragg, David S., Nilsen, Merete Hellner, Emerich, Hermann, Bordiga, Silvia, Lamberti, Carlo, Olsbye, Unni, Tilset, Mats, Lillerud, Karl Petter
Format: Article
Language:English
Subjects:
Condensed matter
Fine structure
Hafnium
High frequencies
Metal-organic frameworks
Radioactive waste
Synchrotron radiation
X-rays
Zirconium
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Summary:High-resolution synchrotron radiation x-ray powder diffraction (HR-XRPD) combined with Hf L3-edge extended x-ray absorption fine structure allowed us to determine the structure of a Hf-UiO-66 metal-organic framework (MOF) showing that it is isoreticular to Zr-UiO-66 MOF [Cavka et al., J. Am. Chem. Soc. 130. 13850 (20081 (http://dx.doi.org/10.1021/ia8057953)]. Thermal gravimetric measurements (coupled with mass spectroscopy) and temperature-dependent synchrotron radiation XRPD proved the high thermal stability of the Hf-UiO-66 MOF. The Langmuir surface area (849 m super(2)/g) combined with the high stability of the UiO-66 framework and with the high neutron absorption cross section of Hf suggest that among all microporous crystalline materials the Hf-UiO-66 MOF possesses the physical and chemical requirements for the interim storage of radioactive waste in a much safer way than is currently available. The first results proving the synthesis of a MOF material with UiO-66 topology realized by a B-containing linker are also reported, allowing a further improvement of the neutron shielding power of this class of materials.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.125429